google/perfetto
Nov 2024 – Feb 2025
4 Months active
Languages Used
SQLTypeScriptC++GNPythonJavaScriptSCSS
Technical Skills
Performance AnalysisSQLTrace AnalysisTypeScriptTypeScript DevelopmentBuild System Management
Alexander Timin
PROFILE
Alexander Timin
Altimin contributed to the google/perfetto repository by building and enhancing core UI features such as an end-to-end Pivot Table, advanced table viewer components, and robust scroll jank analysis tools. Their work involved refactoring legacy TypeScript and JavaScript code, centralizing filter logic, and improving SQL-based data visualization pipelines. Altimin addressed reliability by fixing state management bugs, cleaning up unused SQL metrics, and improving test stability through Python scripting and CI integration. By focusing on maintainability and performance, Altimin delivered features that improved navigation, data accuracy, and UI stability, demonstrating depth in frontend development, component architecture, and performance analysis throughout the project.
Overall Statistics
Feature vs Bugs
53%Features
Repository Contributions
35Total
Bugs
8
Commits
35
Features
9
Lines of code
13,653
Activity Months4
Your Network
537 people
Work History
February 2025
25 Commits • 7 Features
Feb 1, 2025February 2025 monthly summary for google/perfetto: Delivered end-to-end Pivot Table UI with prerequisites, average aggregations, in-pivot filters, and improved formatting for timestamp and duration. Completed major Table Viewer core enhancements and refactor, including robust id column handling, removal of TableColumnSet, simplified argument handling, new SelectColumnMenu, and refactoring of legacy_table/column.ts with test coverage. Overhauled the Filter system by introducing a dedicated Filter class and centralizing filter logic, removing the extraAddFilterActions. Fixed PivotTable internal state handling to avoid persisting state, improving reliability. Stability and quality improvements include flaky test fixes, improved rendering of timestamp/duration in SqlTable explorer, and Chrome SQL metrics cleanup.
25 Commits • 7 Features
Feb 1, 2025February 2025 monthly summary for google/perfetto: Delivered end-to-end Pivot Table UI with prerequisites, average aggregations, in-pivot filters, and improved formatting for timestamp and duration. Completed major Table Viewer core enhancements and refactor, including robust id column handling, removal of TableColumnSet, simplified argument handling, new SelectColumnMenu, and refactoring of legacy_table/column.ts with test coverage. Overhauled the Filter system by introducing a dedicated Filter class and centralizing filter logic, removing the extraAddFilterActions. Fixed PivotTable internal state handling to avoid persisting state, improving reliability. Stability and quality improvements include flaky test fixes, improved rendering of timestamp/duration in SqlTable explorer, and Chrome SQL metrics cleanup.
February 2025
January 2025
8 Commits • 2 Features
Jan 1, 2025January 2025 monthly summary for google/perfetto focusing on delivering measurable business value through UI improvements, enhanced performance analysis capabilities, and improved reliability across the Scroll Jank workflow. The changes enable faster navigation, more accurate jank diagnosis, and smoother rollouts with robust data handling and CI/test stability.
January 2025
8 Commits • 2 Features
Jan 1, 2025January 2025 monthly summary for google/perfetto focusing on delivering measurable business value through UI improvements, enhanced performance analysis capabilities, and improved reliability across the Scroll Jank workflow. The changes enable faster navigation, more accurate jank diagnosis, and smoother rollouts with robust data handling and CI/test stability.
December 2024
1 Commits
Dec 1, 2024December 2024 monthly summary for google/perfetto: Focused on UI stability by removing the CriticalUserInteraction plugin from the default plugin list. This reduces risk of unexpected UI behavior by ensuring the plugin is not active unless explicitly enabled. Implemented via removing org.chromium.CriticalUserInteraction from defaultPlugins and committing the change in 12fd4531f24d79860032268e193c1a30a57ad7b4. This work enhances reliability for users and upstream integrations and establishes a clearer opt-in policy for plugins. Prepared groundwork for future opt-in enhancements and better maintainability.
1 Commits
Dec 1, 2024December 2024 monthly summary for google/perfetto: Focused on UI stability by removing the CriticalUserInteraction plugin from the default plugin list. This reduces risk of unexpected UI behavior by ensuring the plugin is not active unless explicitly enabled. Implemented via removing org.chromium.CriticalUserInteraction from defaultPlugins and committing the change in 12fd4531f24d79860032268e193c1a30a57ad7b4. This work enhances reliability for users and upstream integrations and establishes a clearer opt-in policy for plugins. Prepared groundwork for future opt-in enhancements and better maintainability.
December 2024
November 2024
1 Commits
Nov 1, 2024November 2024 monthly summary for google/perfetto: Delivers a critical bug fix to Scroll Jank Analysis data source by refactoring the scroll jank plugin to query the chrome_event_latencies table directly, removing the deprecated has_descendant_slice usage. This change improves accuracy, reliability, and maintainability of scroll latency measurements and provides a solid foundation for future enhancements in the analysis pipeline.
November 2024
1 Commits
Nov 1, 2024November 2024 monthly summary for google/perfetto: Delivers a critical bug fix to Scroll Jank Analysis data source by refactoring the scroll jank plugin to query the chrome_event_latencies table directly, removing the deprecated has_descendant_slice usage. This change improves accuracy, reliability, and maintainability of scroll latency measurements and provides a solid foundation for future enhancements in the analysis pipeline.
Activity
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Quality Metrics
Correctness93.4%
Maintainability93.4%
Architecture89.2%
Performance84.6%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++GNJavaScriptPythonSCSSSQLTypeScript
Technical Skills
Build System ConfigurationBuild System ManagementCI/CDCode CleanupCode OrganizationCode RefactoringCode StandardizationComponent ArchitectureComponent DevelopmentComponent RefactoringComponent-Based ArchitectureData VisualizationDebuggingError HandlingFront End Development
Repositories Contributed To
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